JP3149637B2 - Intake device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an internal combustion engine, and more particularly to a structure for suppressing vibration of a body of a throttle device.

[0002]

2. Description of the Related Art A conventional intake device for an internal combustion engine is disclosed in Japanese Utility Model Laid-Open No. 3-92515. In this intake device, a surge tank is provided in which the upstream ends of the branch pipes of the intake manifold are collectively connected, and a neck portion of the surge tank serving as an intake inflow portion is located on one side of the branch pipe on one side of the intake manifold. And a body of a throttle device is connected to an end of the neck portion, and an exhaust gas recirculation extending between a mounting flange portion of a branch pipe on one side of the intake manifold and an end portion of a neck portion of the surge tank is provided therebetween. Hereinafter, EGR
Are connected via a tubular member constituting a passage.

[0003]

In this case, the mounting flange of the branch pipe and the neck of the surge tank are connected to each other via a tubular member so that the mounting flange of the branch pipe and the neck of the surge tank are connected. Deformation of a triangular plane including a line connecting an end and the upstream end of the branch pipe can be suppressed, and the vicinity of the neck end of the surge tank vibrates around the upstream end of the branch pipe ( Swinging) can be prevented, and the occurrence of vibration of the body of the throttle device in this direction can be suppressed.

However, with this configuration, it is possible to suppress the end of the neck portion of the surge tank from swinging in the vertical direction of the engine about the line connecting the mounting flange portion of the branch pipe and the upstream end of the branch pipe. Therefore, the occurrence of vibration of the body of the throttle device in this direction cannot be suppressed, and the occurrence of throttle pedal vibration or the like cannot be reliably suppressed. Further, in this configuration, since the tubular member forming the EGR passage is connected to the EGR valve through the mounting flange portion of the branch pipe of the intake manifold, the EGR valve between the EGR valve and the surge tank is provided.
There is also a problem that the length of the passage is long and controllability of the EGR amount is poor.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to reliably suppress vibration of a body of a throttle device and to enhance controllability of an exhaust gas recirculation amount.

[0006]

For this purpose, the present invention comprises a surge tank in which the upstream ends of the branch pipes of the intake manifold are connected collectively. In an intake system for an internal combustion engine, wherein a side of a branch pipe is located on one side of a manifold and a body of a throttle device is connected to an end of the neck, a side of a branch pipe on one side of the intake manifold and the surge tank An exhaust recirculation inlet formed at a neck upstream of a branch pipe upstream end of one side of the intake manifold; and a cylinder head. And the exhaust gas recirculation passage component member fixedly mounted on the exhaust gas recirculation passage via an exhaust gas recirculation tube.

[0007]

In the above construction, the triangular shape includes a line connecting the side of the branch pipe on one side of the intake manifold, the end of the neck of the surge tank, and the upstream end of the branch pipe on one side of the intake manifold. Since the plane of the shape becomes a highly rigid structure and the deformation of the plane is suppressed, the vicinity of the mounting flange of the neck of the surge tank vibrates around the branch pipe upstream end of one side of the intake manifold (swings) ) Can be prevented, and the occurrence of throttle pedal vibration and the like can be suppressed.

Further, the exhaust gas recirculation introduction port at the neck of the surge tank upstream of the branch pipe upstream end on one side of the intake manifold, and the exhaust gas recirculation passage member fixedly attached to the cylinder head are exhausted. Since the exhaust gas recirculation tube is connected via the recirculation tube, the exhaust gas recirculation tube functions as a support member for supporting the neck portion of the surge tank substantially perpendicular to the triangular plane, and the mounting flange portion of the neck portion of the surge tank serves as the engine. Swinging in the vertical direction can be suppressed. Therefore, generation of vibration of the body of the throttle device can be suppressed.

Further, the exhaust gas recirculation tube is connected to the exhaust gas recirculation passage member without passing through the flange portion of the branch pipe of the intake manifold. The length of the exhaust gas recirculation passage between them can be reduced, and the controllability of the exhaust gas recirculation amount is excellent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. 1 to 3, the upstream ends of the branch pipes 2 and 2A of the intake manifold 1 of the internal combustion engine are collectively connected to the surge tank 3 respectively. A neck portion 4 serving as an intake inflow portion of the surge tank 3 is located on one side of the intake manifold 1 on the side of the branch pipe 2A.

At the end of the neck 4 of the surge tank 3,
A body (hereinafter, referred to as a throttle body) 6 of the throttle device 5 is connected. In this case, a mounting flange 7 is formed at the end of the neck 4 of the surge tank 3, and the throttle body 6 is fixedly mounted to the mounting flange 7.
A point A at a substantially middle portion in the longitudinal direction of the branch pipe 2A side of the intake manifold 1 and a point C of the mounting flange 7 of the neck 4 of the surge tank 3 are connected via a stay 8 extending therebetween. You. The stay 8 is formed integrally with the intake manifold 1.

An EGR inlet 9 is formed at point D of the surge tank neck 4 upstream of point B at the upstream end of the branch pipe 2A of the intake manifold 1. This EGR
The inlet 9 includes an inlet 10 formed on the wall of the surge tank neck 4 and a mounting seat 11 around the inlet 10. The EGR introduction port 9 and an EGR passage component member fixedly attached to the cylinder head 12 are provided.
The GR passage 13 is connected via an EGR tube 14.

That is, the EGR passage 13 is fixedly attached to the side outer wall of the cylinder head 12 by the bolt 15. A main body 17 of an EGR valve 16 is fixedly attached to the EGR passage 13 with bolts 18 and nuts 19. The EGR tube 14 is formed in a substantially L-shape, and mounting flanges 20 and 21 are provided at both ends. The mounting flange portion 20 at one end of the EGR tube 14 is in contact with the mounting seat 11 of the neck portion 4 of the surge tank 3 and is fixedly mounted to the neck portion 4 of the surge tank 3 by bolts 23. Also, EGR tube 1
The mounting flange 21 at the other end of the abutment 4 is in contact with a mounting flange 24 provided on the EGR passage 13, and is fixedly mounted by a bolt 25.

In FIG. 1, reference numeral 26 denotes a gasket. According to such a configuration, a point A at a substantially middle portion in the longitudinal direction on the side of the branch pipe 2A of the intake manifold 1 and a point C of the mounting flange 7 of the neck 4 of the surge tank 3 are interposed via the stay 8 extending therebetween. Therefore, a triangular plane including a line connecting the points A and C and the point B at the upstream end of the branch pipe 2A of the intake manifold 1 has a highly rigid structure, and the deformation of the plane is suppressed. Thus, the mounting flange portion 7 of the neck portion 4 of the surge tank 3 around the point B
Vibration (swinging) of the vicinity can be prevented.

According to this configuration, the EGR inlet 9 at the point D of the neck 4 of the surge tank 3 and the cylinder head 12 are higher than the point B at the upstream end of the branch pipe 2A of the intake manifold 1. Since the EGR passage 13 and the rigidly fixed EGR passage 13 are connected via the EGR tube 14, the EGR tube 14 has a triangular plane including a line connecting the points A, C and B. Substantially perpendicular to the above, acts as a support member for supporting the neck portion 4 of the surge tank 3, and the point C of the mounting flange portion 7 of the neck portion 4 of the surge tank 3 is set about the line connecting the points A and B as an axis. Swinging up and down can be suppressed.

As described above, the occurrence of vibration of the throttle body 6 can be reliably suppressed, and the occurrence of throttle pedal vibration and the like can be effectively suppressed. Further, in this configuration, the EGR tube 14 does not pass through the flange portions of the branch pipes 2 and 2A of the intake manifold 1 and the EGR valve 16
Therefore, the length of the EGR passage between the EGR passage 13 (EGR valve 16) and the surge tank 3 can be reduced as compared with the conventional case, and the controllability of the EGR amount is excellent. is there.

As described above, the present invention has been described with reference to the specific embodiments. However, the present invention is not limited to these embodiments, and is attached to the present invention by a person skilled in the art. Without departing from the scope of the appended claims.
It should be noted that various changes and modifications are possible.

[0018]

As described above, according to the intake device for an internal combustion engine of the present invention, in the internal combustion engine in which the body of the throttle device is connected to the end of the neck serving as the intake inflow portion of the surge tank, one of the intake manifolds is provided. The side branch pipe side and the surge tank neck end are connected via a stay extending between them, forming a surge tank neck upstream from the branch pipe upstream end on one side of the intake manifold. The exhaust gas recirculation inlet port and the exhaust gas recirculation passage member fixedly attached to the cylinder head are connected via an exhaust gas recirculation tube, so that one end of the intake manifold has a branch pipe upstream end. Of the surge tank around the neck of the surge tank can be prevented from vibrating (swinging), and also on the branch pipe on one side of the intake manifold and on the branch pipe on one side of the intake manifold. It is possible to suppress the end of the neck of the surge tank from swinging in the vertical direction of the engine with the line connecting the side end as an axis, and it is possible to reliably suppress the occurrence of vibration of the body of the throttle device. In addition, the length of the exhaust gas recirculation passage between the exhaust gas recirculation passage constituting member and the surge tank can be reduced, and the controllability of the exhaust gas recirculation amount is excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an intake device for an internal combustion engine according to the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a view as viewed from an arrow X in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake manifold 2, 2A branch pipe 3 Surge tank 4 Neck 5 Throttle device 6 Throttle body 7 Mounting flange 8 Stay 9 EGR introduction port 12 Cylinder head 13 EGR passage 14 EGR tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 25/07 580 F02M 35/10 F02M 35/104

Claims (1)

(57) [Claims] An upstream end of each branch pipe of an intake manifold is provided with a surge tank which is collectively connected to the branch pipe, and a neck portion of the surge tank serving as an intake inflow portion is provided at a side of the branch pipe on one side of the intake manifold. In the intake device for an internal combustion engine, wherein a body of a throttle device is connected to an end of the neck portion, a branch pipe side of one side of the intake manifold and an end of a neck portion of the surge tank extend therebetween. An exhaust gas recirculation inlet formed at the neck of the surge tank upstream of the branch pipe upstream end of one side of the intake manifold, and an exhaust gas recirculation passage fixedly attached to the cylinder head; An intake device for an internal combustion engine, wherein the members are connected via an exhaust gas recirculation tube.